Guides
How private browser-based media tools really work — and how to check for yourself.
- Do online media converters upload your files? Most online media converters do upload your file to a remote server to process it, where it can be logged, retained, or exposed in a breach — but browser-local tools like ours do the work on your device and never send the file anywhere, which you can verify yourself in the DevTools Network tab.
- Browser-local vs cloud media tools: which is safer? For most everyday media tasks, browser-local tools are safer and faster than cloud tools because your files are processed on your own device and never uploaded, while cloud tools only pull ahead for very heavy jobs or cross-device workflows.
- Is it safe to edit, redact, or merge PDFs online? Editing, merging, or redacting a PDF online is safe only when the tool runs in your browser and never uploads the file — server-based tools place a copy of your contract, ID, or medical record on hardware you don't control, so verify before trusting anything sensitive.
- How in-browser media processing actually works In-browser media processing uses standard browser technologies - WebAssembly, WebCodecs, the Canvas and Web Audio APIs, MediaRecorder, and Web Workers - to read, transform, and export your video, audio, images, and PDFs entirely on your own device, so the files themselves are never uploaded to a server.
- MP4 vs WebM vs MOV — which video format should I use? Use MP4 for uploading, sharing, and playback almost everywhere; use WebM when you need the smallest possible file for web embedding and don't need Apple-device support; use MOV only inside Apple's own editing tools like Final Cut Pro.
- PNG vs JPG vs WebP — which image format should I use? Use JPG for photos where small size matters more than perfect detail, PNG when you need transparency or lossless text and screenshots, and WebP when you want both smaller files and quality, since it covers nearly everything JPG and PNG do in one format.
- How to remove EXIF and location (GPS) data from photos before sharing Phones and cameras embed exact GPS coordinates in EXIF metadata; a canvas re-encode run entirely in your browser strips that location data before you share a photo, no upload required, though it also drops the ICC color profile.